Routing priority of non-cellular over cellular

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive policy information that specifies radio access technology (RAT) priorities for route selection, including a RAT priority of non-cellular over cellular. The UE may establish access for an application over a route that is selected based at least in part on the RAT priority. Numerous other aspects are described.

What is claimed is: 
     
       1. An apparatus for wireless communication, comprising:
 a memory comprising instructions; and 
 one or more processors configured to execute the instructions and cause the apparatus to:
 set up a protocol data unit (PDU) session on a visited network based at least in part on a radio access technology (RAT) priority of non-cellular over cellular; 
 set up an internet protocol security protocol (IPSec) tunnel, to an evolved packet data gateway (ePDG) or a non-Third Generation Partnership Project (non-3GPP) interworking function (N3IWF), over the PDU session; and 
 establish access for an application via a route that is selected based at least in part on the RAT priority of non-cellular over cellular and the set up of the IPSec tunnel. 
 
 
     
     
       2. The apparatus of  claim 1 , wherein the RAT priority of non-cellular over cellular is available if the apparatus is to establish access from the visited network. 
     
     
       3. The apparatus of  claim 1 , wherein the route is a non-cellular over cellular route. 
     
     
       4. The apparatus of  claim 1 , wherein the PDU session is set up with a subscriber identity module (SIM) of the visited network or credential of the apparatus, and the IPSec tunnel is set up with a home network SIM or credential of the apparatus. 
     
     
       5. The apparatus of  claim 1 , wherein the PDU session is set up by accessing internet protocol connectivity of the visited network. 
     
     
       6. The apparatus of  claim 1 , wherein the IPSec tunnel is set up to the ePDG. 
     
     
       7. The apparatus of  claim 1 , wherein the IPSec tunnel is setup to the non-3GPP N3IWF. 
     
     
       8. The apparatus of  claim 1 , wherein the one or more processors are further configured to cause the apparatus to select the route according to a RAT priority order of non-cellular, non-cellular over cellular, and cellular. 
     
     
       9. The apparatus of  claim 1 , wherein the application is one of a voice application, a video application, an instant messaging application, and a virtual private networking application. 
     
     
       10. The apparatus of  claim 1 , further comprising:
 a receiver configured to receive policy information that specifies RAT priorities for route selection, including the RAT priority of non-cellular over cellular, wherein the apparatus is configured as a user equipment. 
 
     
     
       11. A network node, comprising:
 a memory comprising instructions; 
 one or more processors configured to execute the instructions and cause the network node to:
 generate policy information that specifies radio access technology (RAT) priorities, for user equipment (UE) route selection, including:
 a first RAT priority of non-cellular over cellular, and 
 at least one of a second RAT priority of non-cellular or a third RAT priority of cellular, 
 wherein the policy information specifies that the first RAT priority of non-cellular over cellular is available when the UE is to establish access from a visited network; and 
 
 
 at least one transmitter configured to execute the instructions and cause the network node to: 
 transmit the policy information to the UE. 
 
     
     
       12. The network node of  claim 11 , wherein the network node comprises at least one of a policy server, a UE route selection policy device, an access network discovery, or a selection function device. 
     
     
       13. The network node of  claim 11 , wherein the policy information specifies a RAT priority order comprising the first RAT priority of non-cellular over cellular, the second RAT priority of non-cellular, and the third RAT priority of cellular. 
     
     
       14. The network node of  claim 11 , wherein the policy information prioritizes the first RAT priority over the at least one of the second RAT priority or the third RAT priority. 
     
     
       15. The network node of  claim 14 , wherein the policy information prioritizes the second RAT priority over the third RAT priority. 
     
     
       16. A method of wireless communication performed at a user equipment (UE), comprising:
 setting up a protocol data unit (PDU) session on a visited network based at least in part on a RAT priority of non-cellular over cellular; 
 setting up an internet protocol security protocol (IPSec) tunnel, to an evolved packet data gateway (ePDG) or a non-Third Generation Partnership Project (non-3GPP) interworking function (N3IWF), over the PDU session; and 
 establishing access for an application over a route that is selected based at least in part on the RAT priority of non-cellular over cellular and setting up the IPSec tunnel. 
 
     
     
       17. The method of  claim 16 , wherein the RAT priority of non-cellular over cellular is available if the UE is to establish access from the visited network. 
     
     
       18. The method of  claim 16 , wherein the route is a non-cellular over cellular route. 
     
     
       19. The method of  claim 16 , wherein the PDU session is set up with a subscriber identity module (SIM) of the visited network or credential of the UE, and the IPSec tunnel is set up with a home network SIM or credential of the UE. 
     
     
       20. The method of  claim 16 , wherein the PDU session is set up by accessing internet protocol connectivity of the visited network. 
     
     
       21. The method of  claim 16 , wherein the IPSec tunnel is set up to the ePDG. 
     
     
       22. The method of  claim 16 , wherein the IPSec tunnel is setup to the non-3GPP N3IWF. 
     
     
       23. The method of  claim 16 , further comprising selecting the route according to a RAT priority order of non-cellular, non-cellular over cellular, and cellular. 
     
     
       24. The method of  claim 16 , wherein the application is one of a voice application, a video application, an instant messaging application, and a virtual private networking application. 
     
     
       25. A method of wireless communication performed at a network node, comprising:
 generating policy information that specifies radio access technology (RAT) priorities, for a user equipment (UE) route selection, including:
 a first RAT priority of non-cellular over cellular, and 
 at least one of a second RAT priority of non-cellular, or a third RAT priority of cellular,
 wherein the policy information specifies that the first RAT priority of non-cellular over cellular is available when the UE is to establish access from a visited network; and 
 
 
 transmitting the policy information to the UE. 
 
     
     
       26. The method of  claim 25 , wherein the network node comprises at least one of a policy server, a UE route selection policy device, an access network discovery, or a selection function device. 
     
     
       27. The method of  claim 25 , wherein the policy information specifies a RAT priority order comprising the first RAT priority of non-cellular over cellular, the second RAT priority of non-cellular, and the third RAT priority of cellular. 
     
     
       28. The method of  claim 25 , wherein the policy information prioritizes the first RAT priority over the at least one of the second RAT priority or the third RAT priority.